JPH05179880A - Excavated hole bottom part diameter enlarging bottom-dredging bucket - Google Patents

Abstract

PURPOSE:To make slime disposal effective and enable the construction of a bottom enlarged pit of good quality by fitting a scraper removably to an enlarged blade so as to prevent slime from overflowing through a gap between excavating blades. CONSTITUTION:A slime lead-in port 8 is formed at the side part lower part of a bottom dredging bucket body 1 rotatable around a longitudinal axis. An enlarged blade 9 provided with excavating blades 10 at the edge parts and opened outward to enlarge the diameter of the bottom part of an excavated hole is provided in such a way as to close the slime lead-in port 8 of the bucket body 1. In this diameter-enlarging bottom-dredging bucket, a scraper 12 for closing a gap between the excavating blades 10 on the lower part side of the enlarged blade 9 is provided removably at the enlarged blade 9. The scraper 12 is then fitted to the enlarged blade 9 at need so as to prevent the slime from overflowing through the gap between the drilling edges 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bottom dredging bucket for expanding the diameter of the bottom of an excavation hole used in the construction of a so-called bottom expanding pile for enlarging the diameter of the bottom of the pile. Meaning).

[0002]

2. Description of the Related Art In one of the above-mentioned bottom dredging buckets for expanding the diameter of the excavation hole, a slime inlet is formed below the side of the bottom dredging bucket body which is rotatable around the longitudinal axis. On the other hand, a plate-shaped expanding blade provided with an excavating blade at the edge and expanding to the outside of the bucket body to expand the bottom of the excavation hole is provided so as to close the slime introduction port of the bucket body. There is.

The bottom dredging bucket having such a structure is located at the bottom of the hole when a hole reaching the support layer is drilled by, for example, an earth drill, and the bucket is rotated while expanding the expanding blades. As a result, the peripheral wall at the bottom of the hole is enlarged and excavated, and along with this excavation, slime is taken into the bucket body from the inlet. And, as appropriate, by contracting the expansion blades to close the inlet, scrape the slime into the bucket body, and discharge this slime to the ground. Built.

[0004]

However, when the slime is scraped into the bucket body by the above-mentioned expanding blade, the slime overflows through the gap between the excavating blades on the lower side of the expanding blade, and further the bucket is lifted. When this happens, the slime taken into the main body of the bucket also overflows, and the slime treatment was not sufficiently achieved, which was a problem in constructing a high quality expanded bottom pile. The present invention is
It was made in view of such circumstances, and the slime treatment was necessary and sufficient by the simple improvement technology for the expansion blades, which in turn led to the construction of high quality expanded bottom piles. Intended to serve buckets.

[0005]

In order to achieve the above-mentioned object, the present invention is provided with a scraper detachably provided on the expanding blade to close the gap between the excavating blades on the lower side of the expanding blade.

[0006]

According to the above characteristic structure, the slime is prevented from overflowing through the gap between the excavating blades by attaching the scraper to the expanding blade as required.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a bottom dredging bucket for expanding the diameter of the bottom of the drilling hole. In the figure, 1 is a bucket body for bottom dredging that is attached to the rotating shaft instead of the tip of the drill, and is a horizontal plate provided on the lower side. A square shaft 3 is erected on the portion 2, and a square cylinder 5 driven and moved up and down by a cylinder 4 is externally fitted.

An inverted conical member 7 is provided on the lower surface side of the bottom plate 6 of the bucket body 1, and further, below the side portion of the bucket body 1, the upper surface of the bottom plate 6 is at the lower edge. In this state, two slime inlets 8 having a width of about ¼ of the circumference are formed with a phase of 180 degrees.

Reference numeral 9 denotes a plate-shaped expanding blade pivotally attached to the edge portion on the rear side in the rotational direction of the bucket body 1 with respect to the slime introducing port 8 and swingable about a longitudinal axis, and is inclined at the free end side. A plurality of excavating blades 10 are vertically arranged at a predetermined interval at predetermined intervals.
Is installed, and is configured to close the slime introducing port 8 in a state where the lower edge of the expansion blade 9 is in contact with the bottom plate 6.

A link 11 having a universal structure is connected between the inner surface of the expanding blade 9 and the square tube 5, and the expanding blade 9 is moved up and down by the cylinder 4 so that the expander blade 9 is slid. The inlet port 8 can be closed and the bucket body 1 can be opened outward.

Then, by rotating the bucket body 1 while expanding the expanding blades 9 to the outside of the bucket body 1 and opening the slime introduction port 8, the peripheral wall of the excavation hole is excavated in an inverted mortar shape. The slime containing the excavated soil is guided by the expansion blade 9 and taken into the bucket body 1 through the slime inlet 8.

In the bottom dredge bucket having such a structure, as shown in FIG. 2, a scraper 12 for closing a gap between the excavating blades 10 on the lower side of the expanding blade 9 has a lower end edge of the expanding blade 9. In a state of being flush with the lower end edge, the bolt 13 and the nut 14 are detachably provided on the free end side of the expanding wing 9, while elastically deforming when the slime introducing port 8 is closed by the expanding wing 9. The plate-shaped elastic member 15 that contacts the inner surface of the scraper 12 in this state is detachably attached to the plate-shaped member 18 on the bucket body 1 side by the bolt 17 via the stopper 16.

Next, an explanation will be given of one working procedure of the diameter expansion drilling of the bottom of the drilling hole and the slime treatment.
Attach the bottom dredge bucket to the rotary shaft instead of the drill tip,
The bottom dredging bucket is bottomed and the expanding blade 9 is expanded, and the bottom dredging bucket is excavated and rotated.

As a result, the peripheral wall at the bottom of the hole is expanded and excavated, and the slime containing the excavated earth and sand is taken into the bucket body 1 through the inlet 8. And as appropriate
The expansion wings 9 are contracted and closed so as to close the slime introduction port 8, the slime is scraped into the bucket body 1, and the bottom dredging bucket is lifted to the ground to lift the bucket body 1
The slime inside is repeatedly discharged to expand the diameter of the bottom of the hole to a predetermined shape.

Next, the final treatment of slime remaining in the expanded hole is performed. At this time, the scraper 12 is attached to the expanding blade 9 and the elastic member 15 is attached to the plate member 18 on the bucket body 1 side. The bottom edge of the bucket is attached and the bottom dredge bucket is attached to the bottom. As shown in FIG. 3, the expansion blades 9 are opened to rotate the bottom dredge bucket in the excavating direction to take in the slime into the bucket body 1. ..

At the time when a predetermined amount of slime is taken into the bucket body 1, the rotation of the bottom dredging bucket is stopped, and as shown in FIG. Slime is scraped in, but at this time, the scraper 12 is attached to the lower side of the expanding blade 9.
Since it is attached, overflow of slime from between the drilling blades 10 is effectively prevented.

Next, as shown in FIG. 5, the bottom dredge bucket is slightly reversed to expand the expansion blades 9 again, and as shown in FIG. 6, the bottom dredge bucket is rotated forward by a half turn. Scrape the slime to the front of the expanding wing 9 and
As shown in FIG. 5, the expanding blade 9 is contracted and closed, and the scraped slime is scraped into the bucket body 1 to
The slime introducing port 8 is closed by the scraper 12, but at this time, the scraper 12 on the side of the expanding blade 9 is attached to the bucket body 1.
By elastically abutting the elastic member 15 on the side, the lower side of the slime introducing port 8 is almost sealed.

Here, the bottom dredging bucket is gently pulled up to the ground to discharge the slime in the bucket body 1, and the necessary and sufficient slime treatment is completed by repeating the above work preferably three times or more. It After that, by constructing a reinforced cage and placing concrete, high-quality bottom piles with very little slime inclusion are constructed.

In the above embodiment, the elastic member 15 is attached to the plate-like member 18 on the bucket body 1 side. However, as shown in FIG. 8, the slime introducing port 8 is closed by the expanding blade 9. Then, the scraper attached to the expansion wing 9
If 12 is configured to be brought into contact with the edge of the slime inlet 8, it is not necessary to provide the elastic member 15.

[0020]

As described above, according to the bottom dredge bucket of the present invention, it is possible to prevent the slime from overflowing through the gap between the excavating blades by attaching the scraper to the expanding blade as necessary. The slime treatment in the bottom expanding hole has been effectively achieved, and it has become possible to construct a high quality bottom expanding pile with very little slime inclusion.

[Brief description of drawings]

FIG. 1 is a perspective view in which a part of a bottom dredge bucket is seen through.

FIG. 2 is a sectional view of an essential part of a bottom dredge bucket.

FIG. 3 is a diagram for explaining how slime is taken into the bucket body.

FIG. 4 is an illustration of a contracting operation of the expanding blade.

FIG. 5 is an explanation in which the bottom dredge bucket is reversed and the expansion blade is expanded.

FIG. 6 is an explanation drawing of the remaining slime in the bucket body.

FIG. 7 is an illustration of contracting the expanding blades and scraping slime into the bucket body.

FIG. 8 is a cross-sectional view of a main part of a bottom dredge bucket of another embodiment.

[Explanation of symbols]

1 ... bucket body, 8 ... slime inlet, 9 ... expanding wing,
10 ... drilling blade, 12 ... scraper.

Claims (1)

[Claims] 1. A slime inlet is formed below a side of a bucket body that is rotatable around a longitudinal axis and is provided with an excavating blade at an edge and expands outward of the bucket body. In the bottom dredging bucket for expanding the diameter of the bottom of the drilling hole, a plate-shaped expanding blade for expanding the diameter of the bottom of the drilling hole is provided to close the slime inlet of the bucket body. A bottom dredging bucket for expanding the diameter of the bottom of an excavation hole, wherein a scraper for closing a gap between the excavating blades is detachably provided on the expanding blade.